body{
    margin: 0;
    padding: 0;
    position: relative;
}
.header{
    width: 100%;
    background-color: #fff;
    margin: 0;
    padding: 0;
}
.header1 {
    background-color: #333;
    width: 100%;
    height: 40px;
    margin: 0;
    padding: 0;
}
.header2{
    height: 100px;
    width: 100%;
}
.header3{
    width: 100%;
    height: 460px;
}
.header4{
    width: 100%;
    height: 210px;
}
a{
    text-decoration: none;
    color: inherit;
}
ul{
    list-style: none;
    
}